Villanova Preparatory School students, led by Cameron Brock, placed 2,996 flags on the front lawn of the school Sept. 9. This is the fifth year for the memorial installation, begun by Brock's older sister, Madeline. The flags are placed in memory of those who died in the Sept. 11, 2001 attacks on the World Trade Center and Pentagon. The display will remain on view through the weekend. A memorial prayer service honoring the victims and firefighters will be held on the lawn Sept. 12. at 8 a.m.